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The
pair are related to Rebecca through her ex-boyfriend, also called Karl, with
whom she has two children. Karl senior is his father and Craig is his
brother.

Rebecca, 27, met Karl Jnr on a
2003 holiday to Tenerife, years before she appeared on the X Factor in
2010, where she was the runner-up.

For her Hamburg appearance on Tuesday night (left) Rebecca wore a gorgeous print dress with red heels to add a pop of colour and on Monday (right) she was in demure black in Frankfurt

Although there is no suggestion Rebecca had any involvement in the shooting, or condoned it, on Wednesday she was full of irritation, posting a long rant on her Twitter account aimed at someone who she insisted had lied about her.

'Lies, I had somebody who i really cared about and thought a lot of cover up something they had done by lying about me so the past few weeks,' Rebecca wrote, 'it made me really angry I wanted to get even I wanted to scream from the rooftops and tell everybody they know or knew the truth and show them my evidence.

'But then again with my whole new positive thinking I remembered something, when you are an honest person and you live your life as best as you can in an honest way, not hurting or deliberately setting out to upset anyone, people see your character!'

Keep on singing: Rebecca continued her German tour to make sure she didn't disappoint her many fans there

Rebecca posted a long rant on Twitter on Wednesday where she rallied her followers to 'stay beautiful'

Rebecca gives it all that she's got on the stage to the delight of her German audiences

She continued: 'And that is were your reputation comes from and I also figured if they are lying now they have probably lied before meaning the people around them don't need me to affirm they are liars, they have probably already revealed this trait in their character before.

'People will speak bad about you, they will lie, cheat, steal and do what they can to make sure they live the life they want to live! the hardest thing in life, is not becoming like them, not becoming hardened because of what others do.

'Don't ever let what people do to you, or say about you, ruin your character,' she rallied to her followers, 'the truth will always find its way stay beautiful on the inside, don't retaliate to people.'

Rebecca wore a black gown for her performance in German's financial capital of Frankfurt

After her Frankfurt concert the next day Rebecca tweeted that she spent the day in bed watching films

'Life is too short to set records straight, worry about the people that care about you.'

'People that will believe lies about you aren't people you need to worry about,' she concluded. 'you get 1 life, spend your energies on the people you love, not the people you hardly know xxx'

MailOnline contacted Rebecca Ferguson's representatives for a comment on this story.